The Multnomah County Drainage District protects lives, property and the environment through innovative, proactive flood plain management.

MCDD manages the Columbia corridor drainage districts, which include:

Peninsula Drainage District #1 | Peninsula Drainage District #2
Multnomah County Drainage District #1 | Sandy Drainage Improvement Co.


Watch this 6-minute video to learn more about flood control in the Columbia corridor…


Flood Protection in the Columbia River Corridor